/* =============================================================
   STYLES.CSS — Base, CSS Variables, Layout, Sections, Grid
   Clarenville Dental Care
   ============================================================= */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  /* Brand Colors */
  --color-primary:        #0f766e;
  --color-primary-dark:   #0d6360;
  --color-primary-darker: #0a4f4b;
  --color-primary-light:  #f0fdfa;
  --color-primary-border: #99f6e4;

  /* Text */
  --color-text:           #111827;
  --color-text-secondary: #374151;
  --color-text-muted:     #6b7280;
  --color-text-light:     #9ca3af;

  /* Backgrounds */
  --color-bg:             #ffffff;
  --color-bg-subtle:      #f9fafb;
  --color-bg-muted:       #f3f4f6;
  --color-bg-teal-wash:   #ecfdf5;
  --color-bg-slate:       #f1f5f9;

  /* Borders */
  --color-border:         #e5e7eb;
  --color-border-strong:  #d1d5db;

  /* Surfaces */
  --color-dark:           #111827;
  --color-charcoal:       #1f2937;
  --color-amber:          #f59e0b;

  /* Teal accent scale (for hover states, icon accents, footer) */
  --color-teal-300:       #5eead4;
  --color-teal-400:       #2dd4bf;

  /* Ghost button */
  --color-gray-600:       #4b5563;

  /* Focus ring shadow for form inputs */
  --color-primary-focus:  rgba(15, 118, 110, 0.12);

  /* Typography */
  --font-sans:    'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'DM Serif Display', Georgia, 'Times New Roman', serif;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  --leading-tight:   1.25;
  --leading-snug:    1.375;
  --leading-normal:  1.5;
  --leading-relaxed: 1.625;

  --tracking-tight:   -0.025em;
  --tracking-wide:    0.05em;
  --tracking-widest:  0.1em;

  /* Spacing Scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Borders */
  --radius-sm:   0.25rem;
  --radius-md:   0.375rem;
  --radius-lg:   0.5rem;
  --radius-xl:   0.75rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 200ms ease;

  /* Layout */
  --container-max: 75rem;
  --container-px:  1.5rem;
  --nav-height:    4rem;
}

/* ── Reset ─────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4 {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

address {
  font-style: normal;
}

/* ── Container ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

.container--narrow {
  width: 100%;
  max-width: 42rem;
  margin-inline: auto;
  padding-inline: var(--container-px);
  text-align: center;
}

/* ── Sections ───────────────────────────────────────────────── */
.section {
  padding-block: var(--space-20);
  background-color: var(--color-bg);
}

.section--alt          { background-color: var(--color-bg-subtle); }
.section--slate        { background-color: var(--color-bg-slate); }
.section--teal-wash    { background-color: var(--color-bg-teal-wash); }
.section--dark         { background-color: var(--color-dark); }
.section--primary      { background-color: var(--color-primary); }
.section--no-pb        { padding-bottom: 0; }
.section--grad-teal    { background: linear-gradient(160deg, #f8fafc 0%, #f1f5f9 55%, #ffffff 100%); }
.section--grad-slate   { background: linear-gradient(180deg, #f1f5f9 0%, #ffffff 100%); }
.section--grad-subtle  { background: linear-gradient(135deg, #fbfcfd 0%, #f5f7fa 40%, #f8f9fa 100%); }

/* ── Grid ───────────────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

/* ── Section Header ─────────────────────────────────────────── */
.section-header {
  margin-bottom: var(--space-12);
}

.section-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: var(--weight-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.section-label--light { color: var(--color-primary-border); }

.section-heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.section-heading--white { color: #ffffff; }

.section-subheading {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 38rem;
  line-height: var(--leading-relaxed);
}

.section-subheading--light  { color: var(--color-primary-border); }
.section-subheading--center { margin-inline: auto; }

/* ── Features Grid ──────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (min-width: 640px) {
  .grid-3        { grid-template-columns: 1fr 1fr; }
  .features-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 768px) {
  .section-heading { font-size: var(--text-4xl); }
}

@media (min-width: 1024px) {
  .section-heading { font-size: 2.5rem; }
}

@media (min-width: 1024px) {
  :root { --container-px: 2rem; }

  .grid-2 {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }

  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Mobile body pad for sticky CTA bar */
@media (max-width: 767px) {
  body { padding-bottom: 4.5rem; }
}

/* ── Reduced Motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}